.write_container {
  width: 100%;
  height: 800px;
  display: flex;
  flex-flow: row nowrap;
  background-color: #99CCFF;

  > .write_left {
    width: 50%;

    > #write_in {
      width: 100%;
      overflow-y: auto;
    }
  }

  > .write_right {
    width: 50%;
    overflow-y: auto;
  }
  > .write_operation {
    display: flex;
    flex-flow: column nowrap;
  }
}